Title

Development of Sulfur Electrode Materials for High-Performance Lithium-Sulfur Battery

Alternative Title

고성능 리튬-황 전지를 위한 황 전극 물질 개발

DGIST Authors

Jeong-Hoon Yu ; Seung-Tae Hong ; Jong-Sung Yu

Advisor

홍승태

Co-Advisor(s)

Jong-Sung Yu

Issued Date

2026

Awarded Date

2026-02-01

Type

Thesis

Description

Lithium-Sulfur Batteries, Graphitic Carbon, Sulfur Host, Hierarchical Porous Structure, Hollow-Structure

Table Of Contents

List of Contents
Abstract i
List of contents iii
List of tables v
List of figures vi

Ⅰ. Introduction 1
1.1 Motivation 1
1.2 Objective of this thesis 1
1.3 Thesis outline 2
ⅠI. Background 3
2.1 Introduction to Conventional Li-ion Batteries 3
2.2 Li-S Batteries 4
2.2.1 Fundamental Working Principle of Li-S Battery 4
2.2.2 Challenges in Li-S Battery Development 5
2.2.3 Strategies for Sulfur Cathode Improvement 6
2.2.4 Carbon-Based and MOF-Derived Sulfur Cathode Materials 7
2.3 References 8
ⅠII. Hierarchically Porous Graphitic Nitrogen-Doped Carbon via Magnesiothermic
Reduction of ZIF-8 for High-Performance Li–S Batteries 14
3.1 Introduction 14
3.2 Experiment Section 17
3.2.1 Synthesis of ZIF-8 17
3.2.2 Synthesis of N-doped porous carbon (NPC) 17
3.2.3 Synthesis of highly graphitic N-doped hierarchical porous carbon (GNHPC) 17
3.2.4 Preparation of the NPC-S70 and GNHPC-S70 18
3.2.5 Tests of lithium polysulfide (LiPS) adsorption 18
3.2.6 Li2S nucleation tests 19
3.2.7 Coin Cell Assembly and Electrochemical Performance Measurements 19
3.2.8 Materials Characterization 20
3.3 Results and discussion 22
3.3.1 Electrode Substrate Design to Regulate Li2S Deposition 22
3.3.2 Trapping and Conversion of Polysulfides 38
3.3.3 Fast-Charging Performance 51
3.3.4 Performance under High Sulfur Loading and Lean Electrolyte 60
3.4 Conclusions 64
3.5 References 65
IV. Engineering Hollow-Structured Carbon Framework to Facilitate High-Sulfur-Content
Encapsulation for Lithium-Sulfur Batteries 76
4.1 Introduction 76
4.2 Experimental section 77
4.2.1 Synthesis of ZIF-8 78
4.2.2 Synthesis of hollow-structured ZIF-8 78
4.2.3 Synthesis of h-NPC 78
4.2.4 Synthesis of h-GNPC 78
4.2.5 Preparation of h-NPC/S0 and h-GNPC/S90 79
4.2.6 Li2S6 adsorption test· 79
4.2.7 Li2S nucleation test 79
4.2.8 Cell assembly and electrochemical properties measurement 79
4.2.9 Material characterization 80
4.2.10 Computational details 81
4.3 Results and discussion 81
4.3.1 Electrode Material Design 81
4.3.2 Electrochemical Performance 90
4.3.3 Catalytic Behavior of Li2S Deposition and DFT Studies 98
4.4 Conclusions 101
4.5 References 102
V.Summary 112

URI

https://scholar.dgist.ac.kr/handle/20.500.11750/59616
http://dgist.dcollection.net/common/orgView/200000942712

DOI

10.22677/THESIS.200000942712

Degree

Doctor

Department

Department of Energy Science and Engineering

Publisher

DGIST

Show Full Item Record